It seems like there’s a tragic story in the news every year about an athlete who couldn’t take the strain of working out in the heat and humidity. It can be difficult for a coach to tell when conditions turn dangerous, and that’s why there’s the Extech HeatWatch heat alarm. Armed with one, a coach is immediately notified when heat indices go from uncomfortable to dangerous.

The alarm costs $40 and looks and performs like an ordinary stopwatch. It has already been endorsed by the National Health & Wellness Club for offering an objective measurement and audible alert to signal when the heat index becomes potentially harmful. Besides coaches, Extech is targeting the watch at anyone who works outdoors, such as landscapers and construction workers.